Expandable anchoring device

Abstract

An expandable anchoring device includes several openings around a periphery of a tube body. Two opposite ends of the tube body along an axial direction are respectively defined a distal end and a proximal end. Several blocks respectively pass through one of the openings. A length of a distal end side wall of each block along a radial direction is smaller than a length of a proximal end side wall of each block along the radial direction. An expanding member having a tapered portion and a columnar portion is disposed in the tube body and abuts against an inner surface of each block through a columnar surface, hence a side of an outer surface of each block facing the proximal end protrude out of each opening more than another side of the outer surface of each block. A pulling member connected to the expanding member passes through the tube body.

What is claimed is: 
     
         1 . An expandable anchoring device, comprising:
 an outer tube base having a tube body, wherein a direction of an axis of the tube body is defined as an axial direction, and a direction perpendicular to and passing through the axis of the tube body is defined as a radial direction, two opposite ends of the tube body along the axial direction are respectively defined as a distal end and a proximal end; the tube body has an axial hole extending along the axial direction; a periphery of the tube body has a plurality of openings, wherein two opening side walls are respectively provided on two opposite sides of each of the plurality of openings in a direction perpendicular to the radial direction; a distance between the two opening side walls of each of the plurality of openings gradually decreases from an inside of the tube body to an outside of the tube body;   a plurality of blocks respectively disposed in one of the plurality of openings, wherein two block side walls are respectively provided on two opposite sides of each of the plurality of blocks in the direction perpendicular to the radial direction; a distance between the two block side walls of each of the plurality of blocks gradually decreases from the inside of the tube body to the outside of the tube body; a side of each of the plurality of blocks facing the distal end has a distal end side wall, and another side of each of the plurality of blocks opposite to the distal end side wall and facing the proximal end has a proximal end side wall;   
       an inside and an outside of each of the plurality of blocks in the radial direction has an inner surface and an outer surface, respectively; a length of the distal end side wall along the radial direction is defined as a distal end width; a length of the proximal end side wall along the radial direction is defined as a proximal end width; the distal end width is smaller than the proximal end width; a side of the outer surface of each of the plurality of blocks facing the proximal end protrudes out of one of the plurality of openings more than another side of the outer surface of each of the plurality of blocks facing the distal end;
 an expanding member passing through the axial hole and having a tapered portion and a columnar portion that are connected to each other; a diameter of an end of the tapered portion facing the distal end is greater than a diameter of another end of the tapered portion facing the proximal end; the tapered portion has an inclined surface; the columnar portion is connected to the end of the tapered portion facing the distal end and has a columnar surface; at least a part of the columnar surface abuts against the inner surface of each of the plurality of blocks; and 
 a pulling member, wherein an end of the pulling member facing the distal end penetrates through the axial hole and is engaged with the expanding member, and another end of the pulling member has a ring. 
 
     
     
         2 . The expandable anchoring device as claimed in  claim 1 , wherein a distance between two outer edges of the two opening side walls along the direction perpendicular to the radial direction is defined as a first width; a distance between two inner edges of the two opening side walls along the direction perpendicular to the radial direction is defined as a second width; the first width is smaller than the second width; a distance between two outer edges of the two block side walls along the direction perpendicular to the radial direction is defined as a third width; a distance between two inner edges of the two block side walls along the direction perpendicular to the radial direction is defined as a fourth width; the third width is smaller than the first width; the fourth width is greater than the second width. 
     
     
         3 . The expandable anchoring device as claimed in  claim 1 , wherein the outer surface of each of the plurality of blocks is a curved surface protruding outward and has a first radius of curvature; a curved portion is formed at least on a middle of the inner surface of each of the plurality of blocks and has a second radius of curvature; the first radius of curvature is greater than the second radius of curvature; the inner surface of each of the plurality of blocks tightly abuts against the inclined surface of the expanding member through the curved portion. 
     
     
         4 . The expandable anchoring device as claimed in  claim 1 , wherein a first angle is formed between the inclined surface of the expanding member and the axial direction; an angle is formed between the inner surface and the outer surface of each of the plurality of blocks; an absolute value of a difference between the first angle and the angle between the inner surface and the outer surface of each of the plurality of blocks is between 3 degrees and 5 degrees; when the inner surface of each of the plurality of blocks tightly abuts against the inclined surface of the expanding member, an absolute value of a degree of inclination between the outer surface of each of the plurality of blocks and an outer peripheral edge of each of the plurality of openings is between 3 degrees and 5 degrees. 
     
     
         5 . The expandable anchoring device as claimed in  claim 2 , wherein a first angle is formed between the inclined surface of the expanding member and the axial direction; an angle is formed between the inner surface and the outer surface of each of the plurality of blocks; an absolute value of a difference between the first angle and the angle between the inner surface and the outer surface of each of the plurality of blocks is between 3 degrees and 5 degrees; when the inner surface of each of the plurality of blocks tightly abuts against the inclined surface of the expanding member, an absolute value of a degree of inclination between the outer surface of each of the plurality of blocks and an outer peripheral edge of each of the plurality of openings is between 3 degrees and 5 degrees. 
     
     
         6 . The expandable anchoring device as claimed in  claim 3 , wherein a first angle is formed between the inclined surface of the expanding member and the axial direction; an angle is formed between the inner surface and the outer surface of each of the plurality of blocks; an absolute value of a difference between the first angle and the angle between the inner surface and the outer surface of each of the plurality of blocks is between 3 degrees and 5 degrees; when the inner surface of each of the plurality of blocks tightly abuts against the inclined surface of the expanding member, an absolute value of a degree of inclination between the outer surface of each of the plurality of blocks and an outer peripheral edge of each of the plurality of openings is between 3 degrees and 5 degrees. 
     
     
         7 . The expandable anchoring device as claimed in  claim 4 , wherein a side of the axial hole close to the distal end forms a distal portion with a larger diameter, and another side of the axial hole opposite to the distal portion and close to the proximal end forms a proximal portion with a smaller diameter; a shoulder portion of the axial hole is connected between the distal portion and the proximal portion; the expanding member is located in the distal portion; an inside of each of the plurality of openings communicates with the distal portion of the axial hole; the pulling member has a straight section, wherein an end of the straight section facing the distal end passes through the proximal portion and a free end of the straight section is engaged with the expanding member, and another end of the straight section is connected to the ring. 
     
     
         8 . The expandable anchoring device as claimed in  claim 5 , wherein a side of the axial hole close to the distal end forms a distal portion with a larger diameter, and another side of the axial hole opposite to the distal portion and close to the proximal end forms a proximal portion with a smaller diameter; a shoulder portion of the axial hole is connected between the distal portion and the proximal portion; the expanding member is located in the distal portion; an inside of each of the plurality of openings communicates with the distal portion of the axial hole; the pulling member has a straight section, wherein an end of the straight section facing the distal end passes through the proximal portion and a free end of the straight section is engaged with the expanding member, and another end of the straight section is connected to the ring. 
     
     
         9 . The expandable anchoring device as claimed in  claim 6 , wherein a side of the axial hole close to the distal end forms a distal portion with a larger diameter, and another side of the axial hole opposite to the distal portion and close to the proximal end forms a proximal portion with a smaller diameter; a shoulder portion of the axial hole is connected between the distal portion and the proximal portion; the expanding member is located in the distal portion; an inside of each of the plurality of openings communicates with the distal portion of the axial hole; the pulling member has a straight section, wherein an end of the straight section facing the distal end passes through the proximal portion and a free end of the straight section is engaged with the expanding member, and another end of the straight section is connected to the ring. 
     
     
         10 . The expandable anchoring device as claimed in  claim 7 , further comprising a restoring assembly, wherein the restoring assembly comprises a spring washer, a collar, and a spring; the spring washer fits around the straight section of the pulling member and abuts against the proximal end of the tube body; the collar fits around the straight section for fixing and is separated from the spring washer; the spring fits arounds the straight section of the pulling member, wherein two opposite ends of the spring respectively abut against the spring washer and the collar. 
     
     
         11 . The expandable anchoring device as claimed in  claim 8 , further comprising a restoring assembly, wherein the restoring assembly comprises a spring washer, a collar, and a spring; the spring washer fits around the straight section of the pulling member and abuts against the proximal end of the tube body; the collar fits around the straight section for fixing and is separated from the spring washer; the spring fit arounds the straight section of the pulling member, wherein two opposite ends of the spring respectively abut against the spring washer and the collar. 
     
     
         12 . The expandable anchoring device as claimed in  claim 9 , further comprising a restoring assembly, wherein the restoring assembly comprises a spring washer, a collar, and a spring; the spring washer fits around the straight section of the pulling member and abuts against the proximal end of the tube body; the collar fits around the straight section for fixing and is separated from the spring washer; the spring fits arounds the straight section of the pulling member, wherein two opposite ends of the spring respectively abut against the spring washer and the collar. 
     
     
         13 . The expandable anchoring device as claimed in  claim 10 , wherein a restricting washer is disposed in the outer tube base; the restricting washer fits around the straight section of the pulling member and abuts against an end of the expanding member facing the proximal end; a sleeve fits around a portion of the straight section located between the restricting washer and the collar. 
     
     
         14 . The expandable anchoring device as claimed in  claim 11 , wherein a restricting washer is disposed in the outer tube base; the restricting washer fits around the straight section of the pulling member and abuts against an end of the expanding member facing the proximal end; a sleeve fits around a portion of the straight section located between the restricting washer and the collar. 
     
     
         15 . The expandable anchoring device as claimed in  claim 12 , wherein a restricting washer is disposed in the outer tube base; the restricting washer fits around the straight section of the pulling member and abuts against an end of the expanding member facing the proximal end; a sleeve fits around a portion of the straight section located between the restricting washer and the collar. 
     
     
         16 . The expandable anchoring device as claimed in  claim 13 , wherein the proximal end of the tube body forms a wide opening portion expanding outward; the spring washer of the restoring assembly abuts against the wide opening portion; the plurality of openings comprise four openings; the plurality of blocks comprise four blocks; the four openings are arranged at equal intervals around the tube body of the outer tube base; each of the four blocks passes through one of the four openings. 
     
     
         17 . The expandable anchoring device as claimed in  claim 14 , wherein the proximal end of the tube body forms a wide opening portion expanding outward; the spring washer of the restoring assembly abuts against the wide opening portion; the plurality of openings comprise four openings; the plurality of blocks comprise four blocks; the four openings are arranged at equal intervals around the tube body of the outer tube base; each of the four blocks passes through one of the four openings. 
     
     
         18 . The expandable anchoring device as claimed in  claim 15 , wherein the proximal end of the tube body forms a wide opening portion expanding outward; the spring washer of the restoring assembly abuts against the wide opening portion; the plurality of openings comprise four openings; the plurality of blocks comprise four blocks; the four openings are arranged at equal intervals around the tube body of the outer tube base; each of the four blocks passes through one of the four openings.